package ch8;

import java.util.Scanner;

/**
 * @author oldliu
 * @since 1.0
 */
public class GDBH {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        //要输入一个大于6的偶数
        System.out.print("请输入一个数：");
        int a =0;
        while (true) {
            a = in.nextInt();
            if(a % 2 == 0 && a > 6)
                break;

            System.out.println("输入错误，重来！");
        }
        for(int i=3,j=a-3;i<=j;i++,j--){
            //分别验证i和j都是质数

        }
    }
}
